Relay.



S. D. FIELD.

RELAY.

APPLICATION FILED JU NE 17, 1909.

942,81 5. Patented Dec. 7, 1909.

2 SHEETS-SHEET 1.

W. fly 5 /2 [d 5] we V152 M 21%45 WWW fl-wghw S. D. FIELD.

RELAY.

AIPLIOATION FILED JUNE 17. 1909.

Patented Dec. 7, 1909.

2 SHEETS-SHEET 2.

Inventor Attest:

X. W W 2/ M6 service.

' f back\vard,.for purposes of adjustment, by

UNITED STATES PATENT OF ICE,

I D. FIELD,OF STOCKBRIDGE, MASSACHUSETTS, ASSIGNOR TO THE WESTERN UNIONTELEGRAPH COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

RELAY.

Patented Dec. 7, 1909.

other multiplex telegraph systems, and is illustrated and described, inconnection with the quadruple tel'egra 311 system, of my com anionapplication led June 17, 1909, Sr. 0. 502,687.

My invention consists in means whereby mutilation of the signals andfalse movements of the armature of such relay are avoided.

The objects of my invention are to avoid mutilation of'signals, andfalse signals, of tel raph relays, to produce a relay which shal besensitive, ra id inaction, and free from precise and di cultadjustments, and to make the relay simple, compact, and structurallysuitablefor use in telegraph I will now roeeed to describe my inventionwith re erenc'e to the accompanying drawings, in which one form of relayem bodying my invention is illustrated.

In said drawings: Figure 1 shows a side elevation of my improved relay;Fig. 2 shows a front'vicw thereof; Fig. 3 shows a top view thereof; Fig.4 is a diagram illustrating one method of using said relay.

Referring first to Figs. 1, 2 and 3, numeralsl designate the main orline magnet of the relay mounted :as usual upon a frame 2 and arrangedto be moved forward and means of a screw 3, nutt, and spring 5;

. such adjusting means being a common feature of telegraph-relays; I I

6 designates the armature of the relay,

which armature is pivoted at 7, T in the usual trunnion screws, and isprovided with the usual retractile spring 8 and spring-ad justing means9;

This relay comprises, in addition to the I inain magnet 1, other magnets10 and 11,

' all arranged to act upon the same armature;

magnet 10 being supported by the same frame 2 which supports magnet 1,and being arranged to be moved towardand from the armature, for purposesof adjustment, by means of screws 12, 12 and 13.

For structural simplicity, and in order to reduce the mass of thearmature 6 to as low an amount as possible,' the two spools of magnet 10are placed one above the other,

their poles being, therefore, in line vertically. The armature 6 is,theref r f;

double cruciform shape,.comprising an upper longitudlnal portion 14coactmg with the poles of magnet 10, a transverse portion 15ooactingwith the poles of magnet 1, and a lower transverse portion 16,below the pivotal point, coacting with the poles of magnet 11.

The cores of magnets 1 and 10. are prefer ably of soft iron, and arepreferably highly laminated, so as to be capable of extremely rapidmagnetic changes. The cores of magnet. 11 may or may not be permanentlymagnetized,-but may also be laminated, as it is desirable at times thatthese cores, if permanently magnetized, shall be over-powered bycontrary magnetism induced by current discharges passing through thecoils of this magnet.

- The particular relay shown has a rear contact stop 17 but has nocorresponding front contact, as, for the particular purpose for whichthis relay is intended, it requires no such fr nt contact. It has,however, a ront stop, 18, so placed as to prevent-actual contact of thearmature with thecores of the magnets; This front stop is'a small pieceof non-magnetic metal, such as brass, located upon the face ofthe lowercore of-magnet 10. Any other construction 'of-front stop would beequally suitable.

, The rear frame 2 of the relay, the'base plate-19, and the bracket 20supporting the rear contact stop, are, of course, of somenonmagneticmaterml, such as 'brass.

In Fig. at I illustrate diagrammatically onearrangenient of circuits,embodying this relay. The arrangement I have shown is that used in aquadruplex system of my previously mentioned companion application,though I do not here illustrate the polar relay and connections employedin that system, as these-form no part of the neutral relay itself.ln'this drawing L designates a ducto'r, such as are commonly employed inI toi' including the condenser 27, such current duplex and quadruplextelegraph systems. I

The magnets l of the relay are differentially wound, one Winding beingin the line circuit and the other in the artificial line circuit. Themagnet '10, which is commonly termed a holding magnet, is in a bridgecircuit 21 extending from the line conductor L to the artificial lineconductor L,-and in this circuit there is a condenser 22. Thefarmature 6of the relay, and the rear contact stop 17, are ina local circuit 23including a sounder or othersuitable instrument, 24;, to be controlledby the relay, and including also a local battery or source of electricalenergy 25g; and the windings of magnet 11 are in a 4 bridge conductor26, extending from one side ing a condenser 27.

' causes ,the armature of such relay to fall to the other of this localcircuit, and includ- The operation of the relay, as thus connected, isas follows: Supposing current to be flowing in the line L, and thiscurrent to be reversed at the distant station, at the instant of nocurrent during such reversal, there is a discharge of current in thelocal circuit including magnet 10, due to the .change in condenser 22,the effectof which is to energize magnet 10 momentarily andso hold thearmature 6 away from its rear stop 17, at the instant when magnet 1 isdenergized. By the time this discharge has passed the opposite currenthas been established in the line and in the coils of magnet 1, so thatthe armature 6 will be retained against its front stop. In case ofreduction of line eurrcnt strength, such as is intended to operate thisrelay, there is a similar but lesser discharge through the coils ofmagnet 10, which, however, is not sufficient to prevent or appreciablyretard retraction of the armature 6,'since such reduction in currentstrength of necessity continues'for an appreciable time. WVhen, whilethe armature 6 is in its retracted position, the strength of the currentfrom the distant end is increased, condenser 22 charges, producing aflow of current in the local circuit of magnet 10, the result of whichis to assist, slightly, the forward movement of the armature 6.

lo the operation of quadruplex systems there frequently comes a timewhen, just as the current strength in the line increases sulliciently tostart the armature of the neulral relay moving forward, the line currentis reversed. Whenan ordinary neutral relay is used in such a system,this generally hack to its rear contact stop, so making a false signal.The magnet 11 obviates this; because the instant the armature 6, in itsforward movement, breaks contact with the rear contact stop 17, sointerrupting the local circuit in which is a sounder 24, the magnet ofthis sounder is deenergized, and the resulting current in the bridgeconducbeing due not only to the charging of said condenser, but also toself-induction in the magnet of the sounder, energizing magnet 11 andcausing said magnet to hold the armature away from its rear stop untilmagnet i is again energized. Magnet 11 does not impede backward motionof the armature, upon-decrease of line current strength, because thedischarge from condenser 27, momentarily demagnetizes the cores ofmagnet ll, so contributing, momentarily, to firmnessof contact betweenarmature 6 and rear contact stop 17.

What I claim is l. A relay comprising in combination a movably mountedarmature, a main electromagnet therefor, a holding electro-magnetlikewise coacting with the armature, and an auxiliary electro-magnetalso coacting with said armature and acting thereupon in auxiliaryelectro-magnet also coacting with said armature and acting thereupon inthe same' direction as the holding magnet, the core of suchauxiliarymagnet having normal material magnetic value in addition to anymagnetism due to current flowing through its coils.

3. A relay comprising in combination a movably mounted armature, a mainelectromagnet therefor, a holding electro-ma net likewise coacting withthe armature, an an auxiliary electro-magnet also coacting with saidarmature and acting thereupon 1n the same direction as the holding maet, a condenser incircuit with said holding magnet and a condenser incircuit with said auxiliary magnet.

l. A relay comprising in combination a movably mounted armature, a mainelectromagnet therefor, a holding electro-ma netlikewise coacting withthe armature, an an auxiliary electro-magnet also coacting with saidarmature and acting thereuponin the same direction. as the holdingmagnet, the core of such auxiliary magnet having normal materialmagnetic value in addition to any magnetism due to current flowinthrough its coils, a condenser in circuit wit 1 said holding magnet anda condenser in circuit with said auxiliary magnet.

5. A relay comprising a pivotally mounted armature, a mainelectro-magnet therefor, upon one side of the pivot, a holdingelectromagnet for said armature, upon the same side of the pivot as saidmain magnet, and an auxiliary elcctro-magnet for said armature upon theopposite side of the pivot, but acting upon said armature in the same direction as said main and auxiliary magnets,

6. A relay comprising a pivotally mounted armature, a mainelectro-magnet therefor, upon one side of the pivot, a holdingelect-romagnet for said armature, upon the same side of the pivot assaid main magnet, and an auxiliary electro-magnet for said armature uponthe opposite slde of the pivot,- but acting upon said armature in thesame direction as said main and auxiliary magnets, the core of saidauxiliary magnet having normal material magnetic value in addition toany magnetization due to current passing through its coils.

7. A relay comprising a pivotally mounted armature-comprising alongitudinal portion having two transverse extensions, located onopposite sides of thepivotal axis, a main electro inagnet locatedopposite one of such transverse extensions, another electro-ma netlocated opposite a longitudinally extend ing portion of such armature,and a third electro-magnet located opposite the other transverseextension of such armature.

' 8. A relay comprising in combination a pivoted armature having alongitudinally extending portion and two transverse extensions, a mainelectro-magnet located opposite one of said transverse extensions,another horse shoe electro-magnet having its poles both located op ositea longitudinally extending portion of said armature, said poles locatedone beyond the other in the direction of longitudinal extension of sucharmature, and a third electro-magnet having its poles located oppositethe other transverse extension of said armature.

In testimony whereof I afiix my signature,

in the presence of two Witnesses.

STEPHEN D. FIELD. Witnesses:

H. M. MARBLE,

FRANK E. RA FMAN.

